Project Name: New Job Specification Date: 2/2/2017
Project Number: 2
1.0 PART 2 - PRODUCTS
1.1 Materials
1.1.1 Building Controllers
1.1.1.1 Custom Application Controllers: ChillerVu
1.1 boofoo
A. Description: Chiller Plant Controller (CPC)
1. The microprocessor-based chiller plant controller (CPC) shall be provided with a library of factory designed and tested algorithms to supervise and improve the operational efficiency of the individual Product Integrated Controllers (PIC) for each chiller. The chillers may be centrifugal, screw, scroll or reciprocating types. All application software actually performing the required control functions shall be pre-tested and pre-configured.
2. The networked chiller Product Integrated Controllers (PICs) shall interface with a CPC running chiller plant manager software (CPM) installed on the network. The CPC shall allow dynamic interaction between the supervisory software, towers, pumps, and the chiller PIC(s) to create a complete chilled water plant system as described within this specification.
3. The CPC shall include inherent input and output capability. The input/output capability shall include as a minimum a combination of standard HVAC sensor inputs (5k, 10k, 4-20mA and discrete) and analog and digital outputs to control any ancillary equipment necessary to meet the sequence of operation.
4. The CPC shall not interfere with the Chiller PIC’s stand-alone operating or safety algorithms but shall enhance the operation by providing the following inherent capabilities as a minimum. Control of up to eight chillers (staged or rotary) of equal or unequal sizes. Multiple CPM programs may be staged together to provide control of additional chillers.
5. The CPC shall contain factory-programmed software for the following types of mechanical systems:
a. Two to eight chillers with dedicated chilled water pumps and no secondary piping.
b. Two to eight chillers with chilled water pumps in parallel arrangement and no secondary piping.
c. Two to eight chillers with dedicated primary (production loop) pumps and secondary (distribution loop) VFD pumps piped in a parallel arrangement.
d. Two to eight parallel chillers, common primary pumps, constant flow (common constant speed secondary pumps), variable flow (two-way valves) with bypass differential pressure control.
e. Two to eight parallel chillers, common primary pumps, variable flow (two-way valves), with a differential pressure valve and bypass line.
B. AAC Attributes
1. The CPC is an Advanced Application Controller (AAC) which shall be powered from standard, off-the-shelf, Class II, 24-volt transformers. UL-916 (PAZX), cUL-916 (PAZX7), CE, FCC Part 15-Subpart B-Class A. The AAC shall conform to BACnet Advanced Application Controller (B-AAC) device profile as specified in ANSI/ASHRAE 135, BACnet Annex L and shall be listed as a certified B-AAC in the BACnet Testing Laboratories (BTL) Product Listing. AAC shall reside on a BACnet network using the MS/TP Data Link/Physical layer protocol. Products shall be manufactured in a facility having a Quality System that is registered to either ISO 9002 or ISO 9001 Quality Assurance Standard. The controller shall be designed to be easily mounted in a standard NEMA 1 type enclosure without special rails or mounting hardware and as local and national code dictates.
2. The controller shall include a 365-day real time clock and status diagnostic indicator
provided by a seven segment LED.
3. All configuration data will be stored in nonvolatile memory. The controller shall provide a minimum of two days data retention for the time clock.
4. The controller shall include the capability to provide a local interface for all operating values, alarms, etc., via a panel mounted, Local Interface Device. The controller shall also be capable of interfacing to a portable PC for configuring or altering the configuration, setting the address, performing uploads/downloads, etc., through a local interface connector.
C. Network Compatibility: The PIC local interface and network capabilities shall provide required functions independent of the CPC.
The CPC shall support the following network features:
1. Trending
2. BACnet MS/TP Communications
3. BACNet over IP communications
4. Demand Limiting (Load-shed)
5. Alarms
6. Interface to EMS operators station(s)
D. Network Program Display, Service, and Configuration Screens
1. Points Display:
The proposed system shall be capable of providing the following information as a minimum, at an EMS operators station, portable PC, Local Interface:
a. Chiller Manager enable — disable point
b. Current lead and lag chiller sequence and present chiller status
c. Chiller rotation sequence and stage timers
d. Outside air sensor value
e. Current chilled water supply and return temperatures
f. Load Tons
2. Properties Screens
a. Configuration Data: The proposed system shall provide simple, fill-in the blanks configuration screens. The screens shall include all necessary entries with help prompts available for every entry.
b. Maintenance Data: Maintenance data shall be provided to ease the task of troubleshooting. The screens shall have the capability to display all pertinent data necessary to troubleshoot system operation.
E. Chiller Plant Manager Control Program (CPMCP) Requirements
1. Program Enable/Disable:
The CPMCP shall have the ability to be enabled manually by the operator through a point available on the graphic screen, automatically via a network command, automatically via a BACnet schedule or automatically via a schedule/network input combined with OA temperature. The plant shall automatically disable itself if an erroneous entry was made in the configuration, if there are no chillers available to control or if the OA temperature reading is invalid. An alarm shall be generated whenever the program disables itself.
2. Lead/Lag Determination and Rotation:
The chiller start sequence shall be operator-selectable from the first chiller through the last chiller. The staging routine has the ability to control based upon the following parameters:
a. Chilled Water Temperature ONLY.
b. Chilled Water Temperature and/or Load (tonnage)
c. Chilled Water Temperature and/or % Capacity
d. Chilled Water Temperature and/or % KW
e. Advanced load matching (ALM)
3. The CPMCP shall allow the operator to select any of the following Rotation sequences:
a. Daily
b. Weekly
c. Monthly
d. Manual Rotation
e. Rotation by Runtime
f. Never Rotate
F. CPMCP System Management Requirements: At the system level, the CPMCP shall include the ability to coordinate the operation of all plant room equipment.
1. Operator Override:
a. If the CPMCP is operating under a time schedule, the operator shall have the ability to override the unoccupied mode by entering an override schedule through any of the interface devices.
b. If the timed override option is initiated during an occupied period, the time schedule shall remain occupied for the duration of the time entered.
c. If the operator initiates an override during the unoccupied period, the time schedule shall be indexed to occupied for the duration of the value entered.
2. Chiller Override: The CPMCP shall include the ability for the operator to remove individual chiller(s) from the sequence and lock the chiller(s) on or off via the user interface.
3. OA Temperature Override: The CPMCP shall be capable of monitoring outside air temperature and shall secure the chilled water plant whenever the system has been indexed to the occupied mode and the OAT sensor is below its configured setpoint value.
4. Time Schedule Occupied: When the CPMCP time of day reaches the operator adjustable occupancy time the CPM shall be occupied. When the time of day reaches the unoccupied time the CPMCP shall be unoccupied unless one of the above overrides are initiated or the CPM is configured to enable the plant based on a network command.
G. Chiller Faulting: A chiller shall be considered faulted if a fault status is reported to the CPMCP by the chiller PIC. Chillers having a communication failure (after the operator adjustable start time value has expired) shall be left in their last commanded state. Chillers faulted for any other reason shall be commanded off. All faulted chillers shall be automatically replaced, if applicable, to maintain on-line capacity.
H. Start/Stop Delay Timers: The CPMCP shall include operator adjustable time delay values to prevent chillers from cycling due to short duration conditions and to allow plant pulldown conditions.
I. Maximum Demand Limit: A user defined maximum demand limit can be added to each chiller that will be used to prevent it from exceeding a point of maximum operational efficiency. The factor will be sent to the chiller as the % demand limit so as to prevent operation above that point.
J. Stopping Chillers: When the program status is enabled but the CPMCP has determined that cooling is no longer required, the CPMCP shall command all chillers, including the lead chiller to stop in reverse of the starting order. The CPMCP shall monitor each chiller’s status and generate an alarm if a chiller has failed to stop.
2.0 Sequences of Operation
2.1 Sequence of Operation for
Prepared By: Page 1 of 4
Project Name: New Job Specification Date: 2/2/2017
Project Number: 2
Prepared By: Page 1 of 4